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Thermo-shrinkable polyester type film and tube and processing method for preparing the tube

  • US 4,963,418 A
  • Filed: 01/26/1989
  • Issued: 10/16/1990
  • Est. Priority Date: 07/31/1985
  • Status: Expired due to Term
First Claim
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1. A thermo-shrinkable polyester type film which is obtained from a material selected from the group consisting of a polyester having a glass transition temperature of no less than 35°

  • C., a polyester copolymer having a glass transition temperature of no less than 35°

    C., and a mixture of both of said polyester and polyester copolymer with at least one other polymer, wherein said film has the following shrinking properties;

    a shrinking ratio in the one axis is not less than 30% of 80°

    C. and not less than 50% at 100°

    C., anda shrinking ratio in perpendicular axis to the former axis is not more than 15% in the range of 55°

    -105°

    C., and the minimum value of the shrinking ratio occurs at a temperature in the range of 55°

    -105°

    C.; and

    having an orientation factor of not more than 100×

    10-3.

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